Hi i was wondering if anyone can tell me if the NA Z32 300zx's and the TT version's use the same gearbox? or are there strength differences, casing differences, bell housing bolt pattern differences, spline, etc

Same gear box, same gearing, same strength, just about the same everything. The only difference is where the starter bolts to the bell housing and some material around the inner of the bell housing.

The TT uses a larger clutch and flywheel setup so there is slightly more material on the starter surface and a bit more clearance inside the bell housing.

Basically, the N/A tranny can be modified to work with the TT setup and would be just as strong.